replace ref_thread_local::ref_thread_local! with std::thread_local!

removes `ref_thread_local` which was still at 0.0.0 released October 2018 while latest 0.1.1 was released mid November 2021

fixes libraries.rs UB

src/machine/loader.rs

@@ -353,7 +353,7 @@ impl<'a> LoadState<'a> for LiveLoadAndMachineState<'a> {
 
     #[inline]
     fn err_on_builtin_module_overwrite(module_name: Atom) -> Result<(), SessionError> {
-        if LIBRARIES.borrow().contains_key(&*module_name.as_str()) {
+        if libraries::contains(&module_name.as_str()) {
             Err(SessionError::CannotOverwriteBuiltInModule(module_name))
         } else {
             Ok(())